import logging
import os
import socket
logger = logging.getLogger()
##
import requests
from pyroute2 import IPRoute
##
from . import config


class TunnelBroker(object):
    url_ip = 'https://ipv4.clientinfo.square-r00t.net/'
    params_ip = {'raw': '1'}
    url_api = 'https://ipv4.tunnelbroker.net/nic/update'

    def __init__(self, conf_xml, tun_id = None, wan_ip = True, update = True, *args, **kwargs):
        self.conf_file = os.path.abspath(os.path.expanduser(conf_xml))
        logger.debug('Using config path: {0}'.format(self.conf_file))
        self._conf = config.Config(self.conf_file)
        if tun_id:
            self.cfg = self._conf.tunnels[int(tun_id)]
        else:
            tun_id = list(self._conf.tunnels.keys())[0]
            self.cfg = self._conf.tunnels[tun_id]
        self.wan = wan_ip
        self.update = update
        self.my_ip = None

    def _get_my_ip(self):
        if self.wan:
            logger.debug('WAN IP tunneling enabled; fetching WAN IP.')
            req = requests.get(self.url_ip, params = self.params_ip)
            if not req.ok:
                logger.error('Could not fetch self IP. Request returned {0}.'.format(req.status_code))
                raise RuntimeError('Could not fetch self IP')
            self.my_ip = config.IP4(req.json()['ip'], 32)
            logger.debug('Set my_ip to {0}.'.format(self.my_ip.str))
        else:
            logger.debug('WAN IP tunneling disabled; fetching LAN IP.')
            ipr = IPRoute()
            _defrt = ipr.get_default_routes(family = socket.AF_INET)
            if len(_defrt) != 1:  # This (probably) WILL fail on multipath systems.
                logger.error('Could not determine default route. Does this machine have a single default route?')
                raise RuntimeError('Could not determine default IPv4 route')
            self.my_ip = config.IP4(_defrt[0]['attrs']['RTA_PREFSRC'], 32)
            logger.debug('Set my_ip to {0}.'.format(self.my_ip.str))
        return(None)